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Definition
By Mayo Clinic staffA fever is usually a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't dangerous unless it reaches 103 F (39.4 C) or higher. For young children and infants, a slightly elevated temperature may indicate a serious infection.
But the degree of fever doesn't necessarily indicate the seriousness of the underlying condition. A minor illness may cause a high fever, and a more serious illness may cause a low fever.
Usually a fever goes away within a few days. A number of over-the-counter medications lower a fever, but sometimes it's better left untreated. Fever seems to play a key role in helping your body fight off a number of infections.
- Manifestations of infection. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/print/sec14/ch167/ch167d.html. Accessed April 13, 2009.
- Fever. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/print/sec19/ch266/ch266i.html. Accessed April 13, 2009.
- Torpy J. Fever in infants. Journal of the American Medical Association. 2004;291:1284.
- Fever. National Cancer Institute. http://www.cancer.gov/cancertopics/pdq/supportivecare/fever/healthprofessional. Accessed April 13, 2009.
- Febrile seizures fact sheet. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/febrile_seizures/detail_febrile_seizures.htm. Accessed April 13, 2009.
- Richardson M, et al. Assessment and initial management of feverish illness in children younger than 5 years: Summary of NICE guidance. British Medical Journal. 2007;334:1163.
- O'Grady N, et al. Guidelines for evaluation of new fever in critically ill adult patients: 2008 update from the American College of Critical Care Medicine and the Infectious Diseases Society of America. Critical Care Medicine, 2008;36:1330.
- El-Radhi A. Why is the evidence not affecting the practice of fever management? Archives of Disease in Childhood. 2009;93:918.
- Leggett J. Approach to fever or suspected infection in the normal host. Cecil Textbook of Medicine. 23nd ed. W. B. Saunders Company, 2007.
